The IMR zooplankton database holds North Sea data on species composition (abundance), size fractionated biomass as well as biomass for particular zooplankton groups obtained from standard seasonal transects (Utsira-StartPoint, Feie-Shetland, Hanstholm-Aberdeen, Torungen-Hirtshals) and a regional coverage of the northern North Sea and Skagerrak during April-May. Data on species composition are limited.